package com.os.sys.common.utility;


import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * Created by Administrator on 2017/8/4.
 */
public class Captcha {
    // 私有变量用于计算，公有变量用于用户new这个类的时候，进行配置，和获得计算结果

    private Random random = new Random();
    private String g_randString = "0123456789";// 随机字符串种子

    private int g_width = 80;// 图片宽
    private int g_height = 26;// 图片高

    public int stringNum = 4;// 随机产生字符数量
    public String captchaString; // 最终生成的验证码

    private int g_num1 = 0, g_num2 = 0; // 随机产生公式数字
    private String g_flagMark = "+"; // 公式算法
    public int result = 0;  // 公式结果


    /*
     * 获得字体
     */
    private Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    }

    /*
     * 获得颜色
     */
    private Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc - 16);
        int g = fc + random.nextInt(bc - fc - 14);
        int b = fc + random.nextInt(bc - fc - 18);
        return new Color(r, g, b);
    }

    /*
     * 绘制字符串
     */
    private void drowString(Graphics g) {
        char[] c = this.captchaString.toCharArray();
        for (int i = 1; i <= c.length; i++) {
            g.setFont(getFont());
            g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
            g.translate(random.nextInt(3), random.nextInt(3));
            g.drawString(String.valueOf(c[i - 1]), 13 * i, 16);
        }
    }

    /*
     * 绘制干扰线
     */
    private void drowLine(Graphics g) {
        for (int i = 0; i <= 40; i++) {
            int x = random.nextInt(g_width);
            int y = random.nextInt(g_height);
            int xl = random.nextInt(13);
            int yl = random.nextInt(15);
            g.drawLine(x, y, x + xl, y + yl);
        }

    }

    /*
     * 绘制干扰线方式2
     */
    private void drowLine2(Graphics g) {
        for (int i = 0; i < 8; i++) {
            g.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));
            g.drawLine(random.nextInt(80), random.nextInt(30), random.nextInt(80), random.nextInt(30));
        }
    }

    private void initMath() {
        Random random = new Random();
        int a = random.nextInt(10);
        int b = random.nextInt(10);
        if (a > b) {
            g_num1 = a;
            g_num2 = b;
            g_flagMark = "－";
            result = a - b;
        } else {
            g_num1 = b;
            g_num2 = a;
            result = a + b;
        }
    }

    /*
     * 获取随机的字符
     */
    private String getRandomString(int num) {
        return String.valueOf(g_randString.charAt(num));
    }

    /**
     * 生成随机数字图片
     */

    public BufferedImage createRandomNumberImage() {
        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
        BufferedImage image = new BufferedImage(g_width, g_height, BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
        g.fillRect(0, 0, g_width, g_height);
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
        g.setColor(getRandColor(110, 133));
        // 绘制干扰线
        drowLine(g);

        // 绘制随机字符
        if (StringClass.isBlank(this.captchaString)) {
            this.captchaString = StringClass.randomStr(stringNum);
        }

        drowString(g);


        g.dispose();
        return image;

    }

    /**
     * 生成随机计算公式图片
     */
    public BufferedImage createRandomMathImage() {
        initMath();
        BufferedImage image = new BufferedImage(g_width, g_height, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();

        //g.setColor(new Color(0x1296DB));
        g.fillRect(0, 0, g_width, g_height);
        //g.setColor(new Color(0x1296DB));
        //g.drawRect(0,0,g_width-1,g_height-1);

        drowLine2(g);

        g.setFont(new Font("Atlantic Inline", Font.PLAIN, 18));
        g.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));
        g.drawString(String.valueOf(g_num1), 8, random.nextInt(15) + 14);
        g.setColor(Color.BLACK);
        g.drawString(g_flagMark, 23, 22);
        g.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));
        g.drawString(String.valueOf(g_num2), 45, random.nextInt(15) + 14);
        g.setColor(Color.BLACK);
        g.drawString("=", 60, 22);


        g.dispose();

        return image;
    }
}
